EP 0925951 A3 2000-01-12 - Printing apparatus and print method

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Priority

JP 35500897 A 19971224

Abstract (en)

[origin: EP0925951A2] A printing apparatus and a print control method which detect a defective printing element in operation failure status while reciprocate-scanning a printhead, and perform appropriate print control such as complementary printing on an unprinted portion by the defective printing element, without reducing the printing speed. An apparatus, to which the method is applied, has a photosensor 8, to detect ink discharge statuses of a plurality of nozzles of a printhead 5, which is provided between a home position of the printhead and the outside of an effective printing area where image printing is to be made. While the printhead 5 is scanned, test ink discharge is performed at the position of the photosensor 8, and the ink discharge statuses of the nozzles are detected by the photosensor 8. A corrector 123 analyzes the operation statuses of the nozzles of the printhead 5 based on the results of detection in a real time manner. A CPU 25 performs print control based on the results of analysis. <IMAGE>